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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eff9a5338877a004f5dd8c0c92d5121bbfd7858f4b42e53645ba3ee5b9d0db87' 
  AND token = 'BQKku3yPVAiMPOboMxblr3s6iSuOaWrn9EM2P88lnj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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