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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6c123cb734f86966151fd144708ce353e1577604b4364a691fa60e250159fff' 
  AND token = 'W+Cd8Oe9a6rjcniG0FuGO92OtG05v2OcmIuGNDCxEcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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