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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b2d0d0f34bbaf3a0e4d9e21ca6023cb2702f6262025f1e423b8d3f2a0380e67' 
  AND token = 'LzpEQFHwXK8xUdpJ2eKzxCkgNiotb65xU+k6GBDuFBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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