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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7d62e10e3ac135b5f5936fa66737f96c789d0bb980cb99652d8e6c8b9e41fbd' 
  AND token = 'C6BreKkL0B4tbp/osxwBUieBnI+Gpmv9klC5rNj+/vI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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