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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '884584ffe2f8a210a64277632efad52d9db652c4804fceb14bdf38624f729cf7' 
  AND token = 'rgh6bgI6d6RMLP3zkD+9N7i4ajKZfT/Dt/TzVehhHUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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