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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2058eea3e26cd04a65cd8234656ff430e6509f40c78a68c7748c6f184e776674' 
  AND token = 'MPTSKonIO+Hq0Y3vGyePmrYq/SvhUlGxPIm7eeYlGqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00263

JSON explain

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