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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c3a35e6c94c04c12ff5c8bf1701260d3b8e6b6b3cf602f40f49da581d4e386d' 
  AND token = '7Oi3QTjm6Y3RLFEMxX6mn9TCUg/Hxv1Yu8tAzwF2iPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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