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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5fc042184639123e8fdbdc1c2bc91fe90c74645041e7504dd538ec32ea238a9' 
  AND token = 'ZLjWfn4AHH5Ol36l7FbtkeEJ/LHfQ/cq5pUbpfJlOok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00112

JSON explain

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