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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4e2ad049ce3a6985a382a50df6e554fa2ec238eb17c9e8a62d74380d3bd14ab' 
  AND token = 'r1MpcuiZCLQXhnDiYhA4uca2fxRxCJuD/1Qh/7a0MdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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