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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9efed12306be93d611594a2fb1667c150ee4e49ddf4c34a22c884151cf3e5fbb' 
  AND token = 'AoeitpIOfLo7jBU9SziXYf+Sv3oRyHCufdUN4El9CHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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