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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c09bc074f68738b4d02a687d0f0e0350ea545bd3c59aaf92a977bd65f1a07781' 
  AND token = 'f5N0hKe4ZpMLkfCFIY/tvm4B77ivIaXlNlhp5FGczD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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