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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92ad2ab783cdfee3717446ccb79a4cae805cf40a12da04b4b458466a9d1700ac' 
  AND token = 'jnIr7kcSXTihcicCuPw6dYAN7F4SjX4oOfo8yL4F+xQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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