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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d2aa2145ea308be8a8c514dcee8cd0457df0007853c49bf234d86fd4d45f318' 
  AND token = 'nxox9kP3MlUFn2DUxr3qe4t54wb2C4zOX/04G3mR+HY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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