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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32c8f69fd1203fedc859bac04bae0cffe763f95dee521456c48cf58e6e219d95' 
  AND token = 'okAQmoFGlYb8ErKuAOXRotOo99JaypCqyAGmf5O760s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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