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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c8816612b69f1cc7c85796594d1395e74c09c712e495e9d53ad6920db38e76e' 
  AND token = 'MOcypgBFR7q6fIJY683qTjQ31Ao2P3t8ToYPTNrSpAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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