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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7da91d00b6b6308e58708972a02f944a4e9652c89be54d4488526107ab2948d3' 
  AND token = 'yfV3LeJPR1y9nUAIkpfcN82u+O/kneakQ6ynnifx9Lo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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