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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '441fa0e193c25fb1600a51492fc8e28fe2d76ec222a199421685b19c94a355f3' 
  AND token = 'jhg8E7cPzqSmCEQrj43yUUSEdn153GXdfW2Xg+MxKr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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