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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ab3a116b6301f37c4b3f3f8bee4dc2d7497e5f2825bbfc6e7c310f54b202e99' 
  AND token = 'RJQkoAFNVPH5tfWgkO5347kDcX8Ca6FM3HNFRDuAzh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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