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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf0152db186d7463a47be38835d503d175dd61209eada7ae7b4e5a80e07f3b0d' 
  AND token = 'lvN0xyzLXPMxtf4LB0YHj4zjxMsPP6Z7Bb+9hG6FiSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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