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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '419c223cbf72f3aac7451dddfb1fca474fafe36bba34a82ef0d5d359f4dfb3c2' 
  AND token = 'FLNq1Phic7ktZj051Oz6RbcpNi6Dg9CrE9gaqIQ88NA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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