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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11e4cc39229b390aaefd8ac0b9a9fe40bec0720c9450c203d957bcc8eba8faa1' 
  AND token = '/3z4EpARpIaSEwAA32qa7ffowTjhl29P0AaQeAp6aFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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