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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92e4186646db732c6c3089679c97ff6c778e7f0d181c05adf14a3a22d391dcbf' 
  AND token = 'Z1mk6a5IcdXTOedW8F4jNWr4xTcu/06UXLiSK+C1k+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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