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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc3ecbb00c65c3c33db8ffe5d5ff73723c00dd0965bfd7c087eecf434225296a' 
  AND token = 'vpypIJ1L2Coj0+rXSDLFNpe523+/V51TWQIiClEpbgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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