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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7a5ed4fb75a2af37e7c1d083ad2ecbff1ff94b3a084f06f5f87cfa822823522' 
  AND token = '9AVf4mxG3FxkksdzZnlkFrPMMqaKfPK8mz2UYMeWwuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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