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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b7bc2bf2e6a895173b5ff15c41b1d4a1b5928a53a73fb83e2510d0743594ddc' 
  AND token = 'oEVahhtKfw+O0RGKLhLKZ2uXzeC4vMCd7d4SM002pCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}