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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c207cf9131f33c4bddd2a5e135be822ed2bb1ca9c9b94424881109b378766ba3' 
  AND token = 'w97MDcX/8lEZ4qZdOC9NniHjfwIXOP7sOoxVtrpAA/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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