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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a49d841d69216c5b3f3690b1bfc1c1bc8ae589887033086e44f9b3401e52a7d' 
  AND token = 'sBKvcfUn5nDq/p1T85B6krUX/xao/nNA1R7RLUEH8H8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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