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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '243bbc755f7a4b90ef7b3061612bd2eedb562ef131a0b1ce15dd1210e182cb1c' 
  AND token = '2sNCA4hhLg+iFR6w264yKSd8FGDBj7pkgB3IxONW7hw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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