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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60af5c991200bb720715d660dbfd4af1b858a4c027180dd488f63f3c43ecddab' 
  AND token = '0V5JnH/AGv+NqdDNrXV4HqA0ikmJPveNrNiJci1z9Z0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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